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为了提高对上层海洋的模式模拟准确性,为台风海气耦合模式提供更加合理的动量交换耦合方案,文章应用一个分粒径段的海洋飞沫函数给出一个新的海面拖曳系数CD计算方案,它体现了台风高海况条件下海洋飞沫层使海面拖曳系数数值减小特点。论文以2014年第15号台风“海鸥”经过南海强化观测区域时段作为个例,应用POM(Princeton Ocean Model)三维海洋环流模式进行数值模拟试验,结果发现低风速情况下,考虑海洋飞沫因素后的CD与传统计算方案数值相近,在高风速情况下,考虑海洋飞沫因素后的CD方案与模式传统计算方案不同,表现出随风速增长趋缓,直至随风速略有下降现象。与传统拖曳系数方案相比,采用新的拖曳系数方案后,模拟的台风条件下上层海洋的温度降温幅度、混合层深度加深幅度、温跃层强度减弱程度都略有减弱,这些模拟特征与观测事实更加接近。
In order to improve the simulation accuracy of the upper ocean model and provide a more reasonable coupling solution for the coupling of the momentum and the atmosphere in the typhoon, a new CD calculation method for the drag coefficient of the sea surface is presented by using a sub-particle size ocean-based foam function. It reflects the typhoon high sea conditions under the conditions of the ocean bubble layer so that the sea drag coefficient decreases. Taking the Typhoon “Seagull” of 2014 in the period of intensified observation in the South China Sea as an example, the numerical simulation experiment using the three-dimensional ocean circulation model of POM (Princeton Ocean Model) is carried out. The results show that when the low wind speed is considered, The CD after the factor is similar to the traditional calculation scheme. Under the condition of high wind speed, the CD scheme after considering the foam factor of the ocean is different from the traditional calculation scheme of the mode, showing a slowdown with the increase of the wind speed until a slight decrease with the wind speed . Compared with the traditional drag coefficient scheme, the simulation results show that the temperature drop in the upper ocean, the deepening of the mixed layer and the weakening of the thermocline are weakened slightly under the simulated typhoon. The facts are closer.